Power Supply - Atmel AT88CK109STK3 Hardware User's Manual

AT88SCK109STK3
CryptoCompanion

Power Supply

3.2
USB powered
3.2.1
3-6
8699A—CRYPTO—10/09
Downloaded from Elcodis.com electronic components distributor
AT88Microbase Components (back side)
Figure 3.
AT90USB1287
AT88SC108
AVR
16MHz
Crystal
The on-board power supply circuitry allows two possible configurations for the main supply voltage.
Mounted Resistor
R1
R2
5.0 ( USB )
The CryptoCompanion supply voltage is always 3.3V, regardless of R1and R2 configuration.
Main board
Supply Voltage
*see section 3.2.1
Main Board
Supply Voltage
3.3V
5.0V ( USB )
3.3V
3.3V CryptoCompanion
Regulator
R1
0 VCC
R2
* Default
Comments
Default Setting
Main board
Supply Voltage
AT88CK109STK3 User Guide